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Overview

The CMR includes metadata that originate in three dialects: DIF, ECHO, and ISO. The largest portion of CMR collection records are in the SciOps collection, and are inserted into the CMR in DIF format. These are referred to here as the SciOps collection. The second largest portion of metadata for NASA collections originate from ECHO and are inserted into the CMR in ECHO format. These are referred to here as the NASA collection. A third group of metadata in the CMR originate from other agencies around the world and are generally either in DIF or possibly in ISO. These are referred to as the Other collection.

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Metadata providers have a choice about which metadata dialect(s) they use to submit metadata to the CMR. We compared the IDN and NASA collections to understand how does this choice effects affects the metadata content.

Data Selection

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